please make yourself comfortable; please relax your sitting position
Polite set phrase used when inviting someone to sit more comfortably, often in a formal or traditional setting. Equivalent to 'please relax' or 'please don't stand on ceremony'.
Please make yourself comfortable.
Please relax your sitting position, honored guest.
Derived from 平ら (たいら, 'flat, level, calm') with the honorific prefix お and the adverbial particle に, literally meaning 'in a flat/relaxed manner'. The phrase is a polite invitation to adopt a comfortable posture.